JPH0680314A - Reel made of synthetic resin - Google Patents

Abstract

PURPOSE:To provide a heat resistance and chemical resistance synthetic resin made reel to a large diametrical flange part a sufficient amount of resin is supplied at the time of moulding and in which internal distortion does not reside and camber is not generated. CONSTITUTION:This is concerning a reel constituted by joining a half body with flanges 20 continuously provided from an end face plate 11 of a trunk part, windows 21 openly provided on fan parts of the flanges 20 and window frame ribs 22 formed on the marginal outer face of each of the windows 21. In comparison with width of a recessed part 15 with a trunk part burr 14 made on the end face plate 11 in correspondence with a mould gate part for synthetic resin moulding on its bottom face in the state of preventing the trunk part burr 14 from projecting out of the reel end face, diameter of a circular recessed part B 23 with a flange part burr 24 which is larger than the trunk part burr 14 made in correspondence with the mould gate part in the same way adjacent to the window frame rib 22 of the flange 20 in the state of preventing the flange part burr 24 from projecting out of a reel end face (r) is larger. In the case of providing a blind wall 25 on the fan part between two of the neighbouring windows 21, a plural number of through holes 26 are drilled and provided on the blind wall 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts and fixes reels, in particular, electronic circuit parts such as IC chips, etc., on a chain-like body at fixed intervals, and to various precision processing or processing stations including heat treatment. A semiconductor TAB (tab) made of a heat-resistant, acid-resistant and alkali-resistant synthetic resin suitable for winding the chain-like body used for supplying
Related to what is called a reel for use.

[0002]

2. Description of the Related Art Conventionally, this type of reel is 230 to 280.
Bector (trademark of Hoechst, liquid crystal polyester resin), Amodel or Radel (both are trademarks, abbreviations are PFAn and PAS, respectively) with high heat resistance of up to ℃
It is manufactured by injection molding a heat-resistant and chemical-resistant synthetic resin such as f) at a high temperature of about 350 ° C. Therefore, the product has a heat-resistant temperature of 200 ° C or higher and a diameter of 300 to 600 mm.
It is said to be a large diameter.

[0003]

Therefore, in the conventional large-diameter reel of this kind, since the molding is performed by using the synthetic resin having the extremely high melt viscosity due to the heat resistance, the internal diameter of the molded product is increased. When the ambient temperature at the time of use is high, for example, around 200 ° C., there is a problem that the flange “warps” (warps) during use. If the outer peripheral edge portions of the pair of opposed flanges are warped in the opposite direction, the distance between the reels mounted adjacent to each other on one long shaft becomes large, and the IC parts on the chain-like body, etc. However, there was a problem in that it could not be precisely positioned at the processing station. On the contrary, in some cases, the flanges warp in the direction in which they approach each other and the distance between the flange surfaces becomes small, making it difficult to smoothly pull out the chain-shaped body. Therefore, for example, in the case of a reel having a flange diameter of 400 mm, the allowable limit of warpage is set to about 0.5 mm, but no conventional synthetic resin injection molding reel satisfies this standard.

In order to solve the problems of the conventional large diameter reel made of synthetic resin, the present invention pays attention to the flow of the high viscosity molten resin at the time of injection molding and makes various studies and researches. As a result of stacking, a gate is also placed in the mold cavity corresponding to the flange on the outside of the reel body, and the molten resin press-fit amount per unit gate at the flange is less than the press-fit amount per unit gate at the barrel. If the blind wall is provided between the windows of the flange by increasing the margin, and by making a plurality of holes in the wall, the flow of the high-viscosity molten resin is made uniform in the reel as a whole. It is to provide a reel that can meet the quality standards of.

[0005]

The structure of the present invention for achieving the object will be described with reference to FIGS. 1 to 5 corresponding to the embodiments. First, the heat resistance and chemical resistance according to the first invention will be described. The synthetic resin reel with high resistance, especially acid resistance and alkali resistance, has a flange (20) connected continuously from the end face plate (11) of the body (10) to the outside in the radial direction. Is formed by joining half halves with window edge ribs (22) formed on the outer peripheral surface of a plurality of windows (21) opened in the circumferential direction around the hub (12) of the body (10). The point is the same as the conventional product. However, the feature of the reel of the present invention is that the barrel burr (14) generated on the barrel end face plate (11) corresponding to the mold gate portion at the time of molding with synthetic resin does not protrude to the outside of the reel end face (r). Compared with the width of the recess A (15) having the bottom surface (15a) in the state, it occurs closer to the window edge rib (22) of the flange (20) and similarly occurs corresponding to the mold gate portion.
This is in that the diameter of the circular recess B (23) at the center of the bottom surface (23a) is made larger without the larger flange burr (24) protruding outside the reel end surface (r).

On the other hand, the heat-resistant and chemical-resistant, particularly acid- and alkali-resistant synthetic resin reel according to the second aspect of the present invention has a radius from the end face plate (11) of the body (10) to the flange (20). The flange (20) on the hub (1) of the body (10).
A window edge rib (22) is formed on the outer peripheral surface of a plurality of windows (21) opened in the circumferential direction centered on (2) and two adjacent windows (2
This is the same as the conventional product in that it is formed by joining a half body having at least one blind wall (25) sandwiched between 1) and (21).
However, the feature of the reel of the present invention is that the body end face plate (11) and the flange correspond to the mold gate portion when molding with synthetic resin.
A concave portion A (15) having a body portion burr (14) and a flange portion burr (24) on the bottom surfaces (15a), (23a) and a circle, respectively, at a portion near the window edge rib (22) of (20). The recess B (23) is formed, and the blind wall (25) has a plurality of through holes (26) arranged in the circumferential direction.

[0007]

In the first aspect of the present invention, which is configured as described above, a high flow rate due to the small thickness is applied to the cavity portion having a small thickness corresponding to the flange portion during injection molding. A gate with a large opening area to compensate the resistance (that is, a gate corresponding to the large flange burr (24) above)
A high-viscosity molten resin flows in at a sufficient pressure.

Therefore, when the reel according to the first aspect of the present invention is molded, the molten resin becomes higher from the portion of the body (11) to the portion of the flange (20) as in the conventional case, accompanied by a temperature decrease. The situation where the flow-in occurs while generating residual stress and internal strain is completely avoided. this is,
Not only is it convenient for preventing warpage in the flange after molding, but it also contributes to shortening the time required for one shot in the injection process.

In the second aspect of the invention, the window is opened in most of the fan-shaped portion in the state where the flange is divided into six in the radial direction.
When the remaining fan-shaped portion is a blind wall for labeling, for example, since the blind wall is provided with a plurality of through holes, the uneven flow of the molten resin due to the existence of the blind wall is caused. In addition to being reduced once, the directionality of the residual strain, which cannot be completely eliminated, is disturbed by the presence of the plurality of through holes, so that it does not appear as a warp in one direction.

[0010]

1 shows a reel according to an embodiment common to the first invention and the second invention, in which a large-diameter flange (20) is arranged on the same surface from an end face plate (11) of a body (10). The annular flange (20), which is continuously connected, is divided into five fan-shaped portions which are divided into six in the circumferential direction, and the window (21) is radially formed around the hub (12) of the body (10). ) Has been established. And two adjacent windows (2
A blind wall (25) is formed on one fan-shaped portion sandwiched between 1) and (21).

On the outer surface of the body end face plate (11) are formed annular grooves (13), (13) forming concentric circles centering on the hub (12),
On the outer surface of the flange (20), a window edge rib is formed on the periphery of each window (21).
(22) is formed. Diameter of such shape 600mm
It is a synthetic resin reel (R) having heat resistance and chemical resistance, which is obtained by joining two half halves of each other in a facing or symmetrical manner. For the sake of convenience, FIG. 3 showing a cross section or an end surface of the cut portion.
5 shows only one half.

The reel (R) is injection-molded at 350 ° C. using Vector (trademark, mentioned above) as a heat-resistant synthetic resin. A barrel burr (14) is formed in the annular groove (13) of the barrel end face plate (11) corresponding to the mold gate portion during molding. The annular groove (13) containing the burr corresponds to the recess A (15). In other words, a large number of circular recesses A (15) are connected to form an annular shape, and the body burr (14) projects from the bottom surface (15a) of a part of the recesses A.

On the other hand, the circular recesses B (23), which are arranged close to the window edge ribs (22) on the periphery of every other window (21) of the flange (20) and corresponding to the mold gate portion, are also provided. The diameter of the annular groove (1
The width of 3), that is, the diameter of the recess A (15), and the flange burr (2) protruding from the center of the bottom surface (23a) of the circular recess B (23).
4) is larger than the body burr (14) at the center of the recess A (15).

As a result, the high-viscosity molten resin which is press-fitted from the mold gate is pushed from the circular recess B (23) to the window edge rib (22) in the vicinity thereof.
The circular recess B (23) is not formed because the inner peripheral portions of the ribs (22) communicate with each other.
It flows through the rib of the window (21) of every other fan part to the fan part, and further through the radial rib (28) the outermost peripheral rib (29).
It also flows to. The outer and inner annular grooves (13) and (13) forming a concentric circle on the outer surface of the body end face plate (11) are each 120 °
Spacing, however, a total of 6 recesses A by shifting the angle by 60 °
Since (15) is arranged, it goes without saying that the molten resin evenly flows into the body end face plate.

The blind wall (25) has six circular through holes (2
6) are drilled at equal intervals in the circumferential direction. The function of the through hole (26) is as described above. The window (21) not only has a function of seeing through the side of the chain-like body wound on the body, but also speeds up the temperature to the inner layer of the wound body and reduces the weight of the reel.

In this example, the window edge ribs (22) connected in an annular shape
The inner part of is adjacent to the outer annular groove (13). Blind wall
In the center of (25), an extremely shallow dug where a label should be attached.
(27) is provided. The number (16) indicates a key groove formed in the inner surface of the hub (12) in the axial direction, and the number (17) indicates a hole formed in the body end face plate (11) for weight reduction. The pair of left and right reel halves formed as described above are abutted with the annular peripheral edges (10a) of the body (10) and bonded with an appropriate adhesive, or fused using a high frequency welder. To be a finished product.

Although the examples considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these examples, and has the above-mentioned constitutional requirements referred to in the present invention, and The present invention can be carried out by appropriately modifying it within a range that achieves the object of the present invention and has the following effects. For example, the concave portion A in the body portion may not be formed in the shape of an annular groove but may be an independent circular concave portion. In that case, the "width of the recess A" should be read as "the diameter of the circular recess A".

Further, the circular recess B (23) accommodating the flange burr (24) is arranged in all the fan-shaped portions, or the through hole (2
It is also possible to omit the blind wall (25) in which 6) is bored, or to arrange the blind wall at two symmetrical positions around the hub (12).

[0019]

As is apparent from the above description, in the first invention, a large circular concave portion B corresponding to the molding die gate is provided close to the window edge rib even in the flange portion where the window is formed in each fan-shaped portion. Since the heat-resistant synthetic resin having a high melting point and a high viscosity flows through the ribs into the thin flange portion at the same time as the body portion through a sufficient amount without excessive temperature drop,
It is possible to expect a remarkable effect that the flange after molding and cooling does not have a possibility of warping even if it is repeatedly exposed to a high temperature during use. Further, since the molten resin flows into the flange portion and the body portion at the same time, the time required for one shot in the molding process can be shortened.

According to a second aspect of the present invention, in the reel made of synthetic resin, the flange portion of which includes a window-shaped fan-shaped portion and a blind-walled fan-shaped portion, the blind wall is provided with a plurality of through holes. The amount of resin required for the blind wall during molding can be reduced, and not only is the weight balance of the entire flange improved, but the molten resin flow is disturbed by the presence of through holes, so there is no sink mark or flow in the blind wall. Residual stress or internal strain due to marks is less likely to occur, and circular recesses A and B
In addition to arranging the resin on both the body portion and the flange portion, the fear of warpage in the flange portion after molding / cooling can be eliminated.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged end view of a cutting portion taken along line IV-IV in FIG.

5 is an enlarged cross-sectional view taken along the line VV in FIG.

[Explanation of symbols]

 (10) Body (11) End plate (12) Hub (13) Annular groove (14) Body burr (15) Recess A (15a) Bottom (20) Flange (21) Window (22) Window edge rib (23) ) Circular recess B (23a) Bottom surface (24) Flange burr (25) Blind wall (26) Through hole (R) Synthetic resin reel (r) Reel end surface

Claims (2)

[Claims] 1. The end plate (11) of the body (10) to the flange (20)
Are connected to the outside in the radial direction, and the body (1
Multiple windows opened around the hub (12) of (0)
(21) A reel made of a heat-resistant and chemical-resistant synthetic resin obtained by joining a half body having a window edge rib (22) formed on the outer peripheral surface of (21), and a mold gate at the time of molding with the synthetic resin. The width of the recess A (15) on the bottom surface (15a) without protruding the body burr (14) generated on the body end face plate (11) to the outside of the reel end surface (r). , Near the window edge ribs (22) of the flange (20) and similarly corresponding to the mold gate part
Fit the flange burr (24) larger than (14) on the reel end surface (r)
A synthetic resin reel characterized in that the diameter of a circular recess B (23) formed in the center of the bottom surface (23a) in a state where it does not project to the outside is larger. 2. The end plate (11) to the flange (20) of the body (10)
Are connected to the outside in the radial direction, and the body (1
Multiple windows opened around the hub (12) of (0)
Window edge ribs (22) are formed on the outer surface of the peripheral edge of (21),
At least one blind wall (25) between two windows (21), (21)
In a reel made of a heat-resistant and chemical-resistant synthetic resin formed by joining half-divided bodies, the body end face plate (11) and the flange corresponding to the mold gate portion when molding with the synthetic resin.
A concave portion A (15) having a body portion burr (14) and a flange portion burr (24) on the bottom surfaces (15a), (23a) and a circle, respectively, at a portion close to the window edge rib (22) of (20) A synthetic resin reel characterized in that a recess B (23) is formed and a plurality of through holes (26) are formed in the blind wall (25).